Allan Lichtman explains how his system of predicting elections works (Hidden Brain podcast)

Few prognosticators predicted a Donald Trump victory ahead of Tuesday night. Polls showed Hillary Clinton comfortably ahead, and much of America (chiefly the media) failed to anticipate the wave of pro-Trump support that propelled him to victory. But a Washington, D.C.-based professor insisted that Trump was lined up for a win — based on the idea that elections are “primarily a reflection on the performance of the party in power.”

At the end of our September conversation, Lichtman made another call: that if elected, Trump would eventually be impeached by a Republican Congress that would prefer a President Mike Pence — someone whom establishment Republicans know and trust.

“I'm going to make another prediction,” he said. “This one is not based on a system; it's just my gut. They don't want Trump as president, because they can't control him. He's unpredictable. They'd love to have Pence — an absolutely down-the-line, conservative, controllable Republican. And I'm quite certain Trump will give someone grounds for impeachment, either by doing something that endangers national security or because it helps his pocketbook.” ...